**** WARNING **** RMS GRADIENT IS VERY LARGE...
The low-lying vibrations are very sensitive to third and higher order contamination of the genuine harmonic force field. The criterion for a thermodynamic calculation is much more stringent than that for a vibrational frequency calculation in FORCE. In contrast to the zero point energy (ZPE), it is the lowest few genuine vibrations (those most susceptible to error) that contribute the most to the internal vibrational energy, entropy, etc.
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